![]() The 128 bytes of on chip RAM and 128 bytes of external RAM is playing an important role in the 8051 microcontroller. The superior quality of microcontroller is the accessibility of individual bits in many of the special function registers and all four ports of 8051 microcontroller. Compare with the 8085 microprocessor, 8051 microcontroller has more number of registers and more special functional registers (SFRs). Therefore a systematic analysis was carried out to explain the similarities and the differences of 8085 & 8051in all the above aspects. Although both are 8 bit processor, they possess many similarities and lot of differences in architectural, instructional and addressing modes point of view and also in writing and executing the assembly language programs. The most useful processor for control applications is 8051 microcontroller. ![]() The most useful and familiar microprocessor is 8085 microprocessor. Knowingly are unknowingly everyone is using the services of microprocessors because in almost all electronic home appliances like Air conditioners, Refrigerators, Washing machines, Mobile phones, Internet, microwave ovens etc., microprocessors are involved. Microprocessors are becoming an essential part of human life.
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